Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
Don't fall for Amazon's endorsement as I fell and got cheated. My hard earned money got wasted. Sofa is not usable since 4 months of buying. Cushion is of very poor quality. The height of cushion reduced by 40 percent in 4 months. Only cover quality is fine. Shape is also very uncomfortable. Height is very low. Please don't waste your money on this product.